I am amazed that that valve is still in the ground! That was a valve that Hardie manufactured for Rain Bird back in the 80's before they had a plastic valve of their own. You will need to use a universal solenoid or replace the entire valve. Those original solenoids were junk!

I would suggest saving yourself some trouble and replacing that valve. You can get the parts to rebuild it and/ore replace the solenoid but my experience is that about 75% of the time they don't work right after repair and they have to be cut out and replaced anyway so I just replace them to begin with now. Callbacks cost to much to take the chance, especially when you've only got a 1 in 4 chance of success.